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      1 /**
      2  * Copyright 2009 Jonas dahl.
      3  * Copyright 2011-2013 Florian Schmaus
      4  *
      5  * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 
     18 package org.jivesoftware.smackx.entitycaps.provider;
     19 
     20 import java.io.IOException;
     21 
     22 import org.jivesoftware.smack.XMPPException;
     23 import org.jivesoftware.smack.packet.PacketExtension;
     24 import org.jivesoftware.smack.provider.PacketExtensionProvider;
     25 import org.jivesoftware.smackx.entitycaps.EntityCapsManager;
     26 import org.jivesoftware.smackx.entitycaps.packet.CapsExtension;
     27 
     28 import org.xmlpull.v1.XmlPullParser;
     29 import org.xmlpull.v1.XmlPullParserException;
     30 
     31 public class CapsExtensionProvider implements PacketExtensionProvider {
     32 
     33     public PacketExtension parseExtension(XmlPullParser parser) throws XmlPullParserException, IOException,
     34             XMPPException {
     35         String hash = null;
     36         String version = null;
     37         String node = null;
     38         if (parser.getEventType() == XmlPullParser.START_TAG
     39                 && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT)) {
     40             hash = parser.getAttributeValue(null, "hash");
     41             version = parser.getAttributeValue(null, "ver");
     42             node = parser.getAttributeValue(null, "node");
     43         } else {
     44             throw new XMPPException("Malformed Caps element");
     45         }
     46 
     47         parser.next();
     48 
     49         if (!(parser.getEventType() == XmlPullParser.END_TAG
     50                 && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT))) {
     51             throw new XMPPException("Malformed nested Caps element");
     52         }
     53 
     54         if (hash != null && version != null && node != null) {
     55             return new CapsExtension(node, version, hash);
     56         } else {
     57             throw new XMPPException("Caps elment with missing attributes");
     58         }
     59     }
     60 }
     61